Short answers, pulled from the story.
Bidar is known as the City of Whispering Monuments due to the sheer density of its history and 98 monuments. The city holds about 30 tombs within and around its limits, creating a haunting reputation where the silence of the past echoes through stone corridors.
Sultan Ahmad Shah I moved the capital from Gulbarga to Bidar in 1422. This decision was driven by the city's superior climatic conditions and its fertile, fruit-bearing land which offered a stark contrast to the heat of the previous capital.
The Mahmud Gawan Madrasa was destroyed in 1656 when gunpowder stored in a room near the left minar exploded. This accident blew up fully one-fourth of the edifice and obliterated a library of 3,000 manuscripts, a loss of knowledge that historians describe as irreplaceable.
The Bidar Karez is more than 10 kilometers long and features 21 air vents. This underground network of aqueducts was built in the 15th century to provide drinking water to civilian settlements and the garrison inside the Bidar Fort.
The record low temperature ever recorded in Karnataka was 2.9 degrees Celsius, measured on the 5th of January 1901. Bidar is the coldest and wettest place in north Karnataka, with winter nights regularly hovering around 11 to 12 degrees Celsius.